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@ritten pigistes atrnt @ffice Leners Putignano. 76,191, ma Mam, si, 156s.

IMPROVEMENT IN SAW-MILLS.

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TO ALL WHOM IT MAY CONCERN:v

Be it known that I, HERMANN D. HINTERNESCH, of the city and county of Baltimore, in the State of Maryland, have invented a new and useful'ScrollfSawing Machine; I do hereby declare the following to be a'full and exact description thereof, reference being had to thc accompanying,r drawings, forming a part-ofithis specitication, in -Which- Figure I is a side elevation of my non-pitman sawin-gmiachinc,

Figure;2,-a section in the line :v m of tig. l; and

`Figure-3 a plan view, partly iii-section,l of the driving-shaft and eccentrics thereon.

Similar letters indicate like parts in all of the figures.

The'naturc of my invention consists in imparting reciprocating movement to a scroll-saw from a revolvinfafv sli-"aft, placed at any distance therefrom, by means of flexible bands, attached to the upper and lower ends thereof, passing over suitable pulleys, and connected to pins disposedecccntrically upon driving-Tifheels secured on said shaft, (or to bands cncirclingiivhecls secured eccentricall-y'thercnQ/dispensing entirely with Pitman-rods, or other rigid connections or links, between the saw and 'its motive-power.

In my new machine the sav.-Y A is suspended in the usual manner, between sliding bars B B, as illustrated in gs. 1 and 2, workin,r in suitable boxes, C 0,' arranged vertically on a suitable supporting-piece, E, dependent from a beam above, and upon a standard, F, projecting from-the loor below, the table D, through which the saw plays. I prefer to make my sliding bars B B of hollow metal, as illustrated in iig. 2, so as to obtain the least possibleweight with the maximum ofl strength required therein, and I enclose them usually in boxes of hardwood, 'which are at all times easily repaired and adjusted. I am enabled to use saws of the most slender description.

Above and below the sliding bars B B, I place band-wheels or-pulleys G Gr', in suchpositions as that the plane ofmovement of `the sliding bars shall be asnearly as possible tangential. to their peripheries. The bear 'ings of the lower pulley, G', may bev Xed to the door, but those of the upper pulley, G, are supported i`n or on a sliding frame or plate, R, having a. vertical movement, and which may be adjusted at pleasure to any. required height by m'eansof a vp'awl, a, engaging a ratchet-plate, 6,1'xedon the supporting-piece, E; this pawlacting as a brace to maintain the proper tension of the bands passing vover the pulleys. In the plane of these pulleys G Gr, placed above and below the sa\v,`I support in suitable bearings, at the side of the shop, or at any'other point therein convenient to the motive-power, more or 'less remote from the saw, a shaft, K, having a pulley,-Ii, fixed centrally thereon, as seen in iig. 3, to receive a band connecting the same with the arbor from whence motive-power is derived. This. shaft K terminates at either end in suitable driving-wheels M M, having pins in m projecting eccentrically from their outer faces, the distance of these pins from the axis of the shaft being in each precisely thcsame, and being determined always by the extent of motion desired in the play of the saw. These' pins m m'arc each fitted with encircling friction-rollcrs c'c,which turn freely and loosely thereon. i

Immediately below the drivings-wheels M M, and on either side of the line of their axis, I place pulleyi Wheels N N', securing their bearings inl standardsV projecting from the Hoor in the plane of the lower front pulley-wheel, G. I place, also, an additional pulley-wheel-R above the rearmost pulley, N, in theplane ofthe upper front pulley, Gr. I'then connectthe pins m men the driving-\\heels M M with the saw A, by means of flexible bands S S', of leather or other suitable material, which are secured to the rollers c e upon said pins m, andvpass respectively, the one, S, unde'x` the pulley-wheels N and G', to the lower end of the saw, to which it is then attached, and the other, S, under thepullev N and over the upper pulleys I and Gc, to the upper end of the saw, to which it is likewise secured.

The strain upon said bands S S and upon the saw A may be increased or diminished byan an adjustment of the sliding plate R, carrying the upper pulley, G. Although it is'inore 'convenient to make the upper front pulley, G, adjustable, to regulate thereby the tension of thc bands, as described, either of the bandpulleys may thus be arranged to accomplish the same purpose. 'Ihe drivinggwheels M M and pulleys are all madcdight,

t and are carefully adjusted'in their bearings. Instead of securing the ends ofthe bands S St o pins placed f ccccntrically upon the outer faces of the driving-wheels M M, as described, I contemplate securing them t0 bands or encircling collars fitted loosely yet closely upon wheels keyed or secured eccentrically upon the drivingshaft, or otherwise, by similar mechanical equivalents, obtaining directly from the revolution of the shaft a draught upon the one and the other alternately, as herein set forth, without the employment of ptman-rods or bars. i y i With the bands, saw, and pulleys adjusted as described, the continuous revolution of the driving-shaft K and wheels M eamynr the eccentric-pins m'will alternately draw and release the one band and the other, cansing them to pull' alternately u'pon the upper and lower ends of the saw, and thus impart thereto a constant reciprocating movement. The employment of friction-rollers upon the crank-pins m, in` combination with the adjustment ofthe bauds by means of the sliding frame R, carrying the upper front pulley, G, and kept braced by -the pawl a, as above set forth, prevents wholly any jar or rattle of the parts in their movements, the tension ofthe bands upon the pins m and saw A being readily kept equal and constant, so that the machine is absolutely noiseless, as well as perfectly steady in operation, even at its highest speed.

Thus, by meansof my invention, I am enabled to drive the saw at an extraordinary speed without noise or strain, or the jar occasioned in all the ordinary forms of reciprocating machines bythe change in the direction of the movements of the son. The highest` rate of speed yet attained with ordinary jig-saws has not, to my knowledge, exceeded four hundred andfty strokes a minute,- whereas in my machine I obtain twelve hundred strokes a minute with perfect steadiness and ease of movement?, enabling tbe operative to accomplish with ease twice the amount of work, 'and to produce it in a smoother and'more finished state.

By dispensing wholly with pitman-rods andcranks, and the ordinary saw-gates, I avoid the annoyance and expense resulting from the constant nced of attention and repairs inthe 'use of such devices, whilst the sinrpleity of all'the parts of my machine enables it `to be manufactured at a greatly reduced first cost.

I do not claim broadly the use of flexible bands for the purpose of operatinga jig or scroll-saw, as sTrch are now in 'use in combination with Pitman-rods and levers in other machines; but having fully described my invention, I i

I claim as new, and desire to secure by` Letters'Patent* y Bands or cords SS, when combined directlyltvith cranks or eccentrica upon' a revolving shaft, K, and so arranged as to communicate therefrom areciprocating movement to a scroll-saw, A, substantially in the, manner herein set forth.

The foregoing specification of my newanduscful sawing-machine signed by me, this third day `of February, vA. D. 1868. i

' H. D. HINTERNESCH;

Witnesses:

Emu. F. BROWN,

DAVID A. BURR. 

